The Battle of the Zab (Arabic: معركة الزاب), also referred to in scholarly contexts as Battle of the Great Zāb River, took place on January 25, 750, on the banks of the Great Zab in what is now the modern country of Iraq. It spelled the end of the Umayyad Caliphate and the rise of the Abbasid Caliphate, which would last from 750 to 1258.
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